ext4: Enable extents by default
Turn on extents feature by default in ext4 filesystem, to get wider
testing of extents feature in ext4dev. This can be disabled using
-o noextents.
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b806e68..9c8baf4 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -734,7 +734,7 @@
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
- Opt_grpquota, Opt_extents,
+ Opt_grpquota, Opt_extents, Opt_noextents,
};
static match_table_t tokens = {
@@ -785,6 +785,7 @@
{Opt_usrquota, "usrquota"},
{Opt_barrier, "barrier=%u"},
{Opt_extents, "extents"},
+ {Opt_noextents, "noextents"},
{Opt_err, NULL},
{Opt_resize, "resize"},
};
@@ -1120,6 +1121,9 @@
case Opt_extents:
set_opt (sbi->s_mount_opt, EXTENTS);
break;
+ case Opt_noextents:
+ clear_opt (sbi->s_mount_opt, EXTENTS);
+ break;
default:
printk (KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
@@ -1551,6 +1555,12 @@
set_opt(sbi->s_mount_opt, RESERVATION);
+ /*
+ * turn on extents feature by default in ext4 filesystem
+ * User -o noextents to turn it off
+ */
+ set_opt(sbi->s_mount_opt, EXTENTS);
+
if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
NULL, 0))
goto failed_mount;